Best AI Workout Apps in 2026: What Each One Costs

By the Trunk teamUpdated September 7, 202615 min readPrices verified September 7, 2026

The best AI workout apps in 2026 charge between $23.99 and $399.99 for twelve months of the tier that writes your program, and almost none of them let you point the ChatGPT or Claude account you already pay for at your own lifting log. Three do: Hevy, through an official ChatGPT integration that costs nothing; Trunk, through a $9.99 one-time unlock that works with any assistant that can open a link; and Liftin', whose ChatGPT and Claude MCP beta was announced 2026-07-22. Every price below was checked on 2026-09-07 and links to the page it came from.

One caveat on that $23.99 floor: it buys Hevy Pro, whose generator Hevy says is an algorithm and does not rely on AI. The cheapest tier from a vendor that markets the feature as AI is Boostcamp Pro at $59.99 a year.

Disclosure: this is Trunk's blog, and Trunk is one of the apps in the tables. It is sorted by price like every other row, and its gaps get their own section.

Two different products share the name "AI workout app"

The category has split in half, and the two halves are priced differently.

Type A: the app's AI writes your program

You answer questions or log sets, and the app generates and adjusts a plan. Fitbod, Juggernaut AI, Dr. Muscle, Freeletics, Zing Coach, Boostcamp and Alpha Progression all work this way, using two very different mechanisms:

• Questionnaire generators. You fill in goal, experience, days per week and equipment; a rules engine emits a multi-week block. Boostcamp's AI Coach and Hevy Trainer are this. Hevy is unusually blunt about it — its help center states that programs are generated using an algorithm and do not rely on AI (source). Alpha Progression never uses the word AI at all; it calls its engine an algorithm (source).
• Adaptive engines and LLM chat. Fitbod rebuilds each session from per-muscle recovery and your logged history. Dr. Muscle recomputes reps, sets and weight after every set and adds an in-app AI chat. Zing Coach runs a conversational coach that checks in daily on mood, energy, sleep and readiness (source), and Zing's privacy policy states that assistant is powered by the OpenAI GPT API (source). Ellim's Smart Session is described on Ellim's own comparison pages as LLM-based conversational AI (source).

Type B: the app hands your log to an AI you already have

Here the app runs no AI of its own. It exposes your training data to ChatGPT, Claude or Gemini, and the assistant does the thinking. Of the sixteen trackers researched for this article, three ship a first-party route: Hevy with HevyGPT and a new send-to-assistant button, Trunk with a generated key and a pasted prompt, and Liftin' with an MCP beta. Outside that set the bridge layer is growing — Caliber ships its own MCP server, arvo-mcp is free and open source, AthleteData sells a paid bridge covering 30+ services including Hevy, and community MCP servers exist for Hevy and Boostcamp. Type B is also why the prices below split: an app with no AI vendor bill has no per-user AI cost to recover from you monthly.

What every AI workout app costs

Sorted by the cheapest route to twelve months of the generator. USD, verified 2026-09-07.

USD from the US App Store or the vendor's own pricing page, verified 2026-09-07. "No" means the option is not offered; "—" means a price is published with no billing period attached. Apple runs concurrent price tiers and prices change without notice, so check the listing before you buy.

Five rows need a footnote. Hevy's US listing carries a second Hevy Pro Monthly SKU at $3.99 next to the $2.99 one, with no published explanation; on the $3.99 SKU a year paid monthly is $47.88 (source). Dr. Muscle adds a $18.99/mo meal-plan add-on, and its own website quotes $49/month and $389/year (source) where the App Store shows $49.99 and $399.99 (source). Fitbod's lifetime membership is sold only during a Black Friday week, capped at 1,000 units, with the price listed as to be announced (source). Freeletics sells a one-time Lifetime Access on its own website, not in the App Store, and the price could not be captured — check the app's pricing page (source). Zing Coach and Freeletics both list prices with no billing term — Zing at $18.99, $39.99 and $59.99, only "Zing Premium 3 Months, $29.99" carrying a label — so both sit out of the 12-month table rather than being guessed at (source).

The 12-month cost, side by side

Twelve months is the number that decides most purchases. The right column compares each option to a single $9.99 unlock.

USD, verified 2026-09-07; every price here is sourced in the master table above. The monthly totals are our own arithmetic on each verified monthly price (12 x monthly), and prices may change.

Now stack it with the assistant you may already pay for. ChatGPT Plus is $20/month on OpenAI's pricing page, and Claude Pro is $20/month, or $200 up front for a year, which Anthropic bills as $17/month (source, source). Trunk+ plus a year of Claude Pro annual is $209.99; plus twelve months of ChatGPT Plus, $249.99. Both land under one year of Juggernaut AI or Dr. Muscle, and the assistant handles the rest of your life too. On a free assistant tier the total is $9.99. We break the math down further in what AI fitness apps actually cost.

What each app's AI actually does

Fitbod — adaptive generator, no free tier

Fitbod builds every session from per-muscle recovery, your equipment, goal and logged history, and adjusts as you edit. It is the most polished version of Type A, rated 4.8 from roughly 284K US App Store ratings. The catch is access: no permanent free tier, a 7-day trial that requires opting into a plan first, and if the trial lapses you can view old workouts but not log new ones (source).

Juggernaut AI — powerlifting programming at $34.99/mo

The AI is the whole product: an individualized powerlifting or powerbuilding block that adapts from a daily readiness check-in and RPE feedback. Juggernaut describes proprietary algorithms rather than a chat assistant, and no official page documents an in-app AI chat; it is also not a general tracker. There is no free tier of any kind after the two-week trial, and no one-time option (source).

Dr. Muscle — the most expensive app here

Dr. Muscle recomputes sets, reps and weight after every set, runs automated deloads, and adds an in-app AI chat that can see your goals and basic stats. Genuinely hands-off, and the priciest subscription in the table by $50 a year. The free plan after the 14-day trial gives you one exercise recommendation per day (source).

Freeletics and Zing Coach — coaching apps, thin lifting logs

Freeletics generates each session and re-plans from your difficulty feedback; its Coach+ chat assistant has been in pilot since July 2024, English first, and Freeletics publishes no page saying whether it is included in the subscription. Free access is a demo: 34 signature workouts, no personalized plan. Zing rewrites your plan from a daily chat check-in and adds camera-based form tracking, but its manual weight and rep entry is limited. Both are built around bodyweight, HIIT and general conditioning rather than barbell progression, so treat them as training apps, not set-and-rep trackers.

Boostcamp — questionnaire generator, large free library

Boostcamp's AI Coach is a short questionnaire that emits a multi-week block, and it is Pro-only (source). Its official pages advertise $4.99/mo, which is the $59.99 annual plan divided by twelve. The free tier is the strongest thing about it: the 11,000+ program library including most of the 130+ coach-designed programs, the tracker, RPE and RIR fields, rest timers and a plate calculator, no time limit. Twenty-plus coach programs stay behind Pro.

Alpha Progression — an algorithm that does not claim to be AI

Per-set weight and rep targets, periodization and deloads, all rules-based. The vendor deliberately avoids the word AI. Free covers unlimited logging, 795 exercise videos, your own plans and CSV export; the generator and the recommendations are Pro-only, with no lifetime tier (source). On Apple devices it is iPhone-only, with no iPad, Mac or Apple Watch app, but there is an Android app with 1M+ Google Play downloads.

Ellim — free AI import, expensive AI coaching

Ellim's free tier is unusually generous: unlimited logging, unlimited custom routines, a 3,500+ exercise library, free analytics per its App Store description, and a free AI routine import that turns a photographed or pasted plan into something trackable. The generative features — Smart Session, the routine coach, meal photos — sit behind Ellim Plus, with no lifetime option (source). Ellim's privacy policy names Anthropic, OpenAI and Google as the processors behind them (source) — a clean illustration of why in-app AI gets billed monthly.

Bringing your own ChatGPT, Claude or Gemini

HevyGPT, and Hevy's new send-to-assistant button

HevyGPT is an official custom GPT inside ChatGPT, connected from Hevy's Profile, then Settings, then Integrations. Once connected, ChatGPT can analyze your training history and save generated routines back into Hevy as a folder in the Workout tab. Hevy's own feature page states that it costs nothing, that a free ChatGPT account works, and that Hevy Pro is not required (source).

Its limits are equally concrete. HevyGPT is ChatGPT only, no Claude and no Gemini, and Hevy states it does not work in the Android ChatGPT app, with no documented workaround. Free Hevy accounts are capped at 4 routines, so a plan with more than four days cannot be imported without Pro (source), and Pro is $2.99/mo, $23.99/yr or $74.99 one-time on the US App Store, verified 2026-09-07 (source). Hevy's iOS v3.1.12, released 2026-09-03, added a button that sends one finished workout at a time to ChatGPT or Claude, with no help article explaining the mechanism (source). Hevy's public API, which the community MCP servers use, requires Pro (source).

Hevy is mature, cross-platform, and rated 4.9 from roughly 91K US App Store ratings. If you already live in Hevy and ChatGPT, connect HevyGPT and buy nothing; the feature-by-feature comparison is in HevyGPT vs Trunk Connect AI.

Liftin' and the third-party bridges

Liftin' announced an MCP beta on 2026-07-22 offering integration with ChatGPT or Claude (source), though the setup method and whether it needs a paid tier are not on any official page; Liftin' Unlimited Lifetime is $99.99, verified 2026-09-07 (source). Paid third-party MCP services and free open-source Hevy bridges also exist.

Trunk — a key and a pasted prompt

Trunk runs no AI of its own. Trunk+ costs $9.99 once and turns on Connect AI: Settings, Trunk+, Connect AI, Generate Key, Copy Prompt. The prompt contains a private URL to your data. Paste it into ChatGPT, Claude, Gemini or anything else that can open a link, and the assistant reads your logged sets — reps, weight, volume, per-set notes, dates and plate configuration. Ask it for a program and it replies with an import link; tapping that opens a confirmation page, and tapping Add to Trunk puts the program in the app immediately.

Two details worth knowing before you buy. The AI can create programs, sessions and exercises, but it never writes sets, reps or weights — you log those in the gym, so the history stays real. And the data URL is a bearer secret: anyone holding it can read your workout data until you revoke the key. Nothing syncs in the background; the assistant reads only when you paste the link.

On which assistants work: ChatGPT's help center confirms web search on the free tier, and OpenAI documents a ChatGPT-User agent that may visit a web page when a user asks about one (source, source). Claude needs web search switched on for that chat from the "+" button in the composer, after which it can retrieve full content directly from URLs you provide (source). Neither Google nor Perplexity publishes a page saying a pasted URL gets opened; Trunk's developer reports both work in practice, which is testimony rather than documentation. Gemini's free tier also caps context at 32k tokens (source), so on a long history append ?last=5 to send only the five most recent sets per exercise. The step-by-step is in connecting ChatGPT to your workout tracker.

Where Trunk fits, and where it does not

Verdict: the best AI workout apps by user type

Every price below is the verified figure from the tables above.

• You already use Hevy and ChatGPT. Connect HevyGPT. It is free, official, and bidirectional inside ChatGPT. Look further only if you hit the 4-routine free cap or you want Claude or Gemini instead.
• You want the app to think for you and will pay monthly. Fitbod at $15.99/mo or $95.99/yr is the mature choice; Dr. Muscle at $49.99/mo is harder auto-regulation for a lot more money.
• You are a competitive powerlifter. Juggernaut AI at $34.99/mo or $349.99/yr is built for meet prep and nothing else. Budget for it first, because there is no free mode to fall back to.
• You want a proven program, free. Boostcamp's free library of coach-written programs beats any generator at $0, and its AI Coach is a questionnaire rather than a conversation.
• You want per-set targets and CSV export without paying. Alpha Progression's free tier logs unlimited workouts and exports CSV; the recommendations cost $79.99/yr.
• You use Claude or Gemini, want no caps, and refuse another subscription. Trunk+ at $9.99 once is the fit — on an iPhone, accepting a new app with one rating and no export button.
• You are on Android. Trunk is not an option, and most of the field is: Hevy, Boostcamp, Fitbod, Alpha Progression, Zing Coach, Freeletics, JEFIT, Dr. Muscle and Juggernaut AI all ship Android apps. HevyGPT does not work in the Android ChatGPT app, and Hevy documents no workaround.

Before you subscribe to anything, open the assistant you already pay for and ask it a real question about your last four weeks of training. If the answer is useful, you may not need a second, narrower AI that only sees one app's data.