Comparison

Flexion vs Soln

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Flexion

Analyze your workout form with AI-powered video feedback and chat with a virtual coach for personalized training and nutrition advice. Track progress, log meals, and prevent injuries with detailed insights.

Highlights
  • AI video form analysis
  • Conversational workout logging
  • Nutrition tracking
  • Personalized coaching
  • Progress insights
  • Multiple coach personalities
Features
Read full description

Flexion - AI Personal Trainer. Your eyes in the gym. Meet your new workout partner. Flexion combines computer vision powered form analysis with a coach you can actually talk to—helping you train smarter, stay consistent, and see results faster. TRAIN WITH CONFIDENCE Upload a video of any lift and get instant feedback on your form. Visual Highlights show you exactly what to fix with color-coded annotations on each frame—green for what you nailed, red for what needs work. YOUR COACH, YOUR WAY Chat naturally with your AI trainer to log workouts, track your nutrition, ask questions, and get personalized insights. Just say "bench 185 for 10" or take a picture of your food and your coach handles the rest. Choose from 4 coaching personalities—from high-energy motivation to calm, methodical guidance. KEY FEATURES • Video Form Analysis – Frame-by-frame technique evaluation • Visual Highlights – See exactly what your coach is pointing at • Conversational Logging – No more tapping through forms • Nutrition Tracking — log meals, scan barcodes, track macros, and set custom targets for training and rest days • Program Upload — Upload PDF training programs directly in chat for your AI coach to follow • Progress Insights – Charts and stats, just ask • 4 Coach Personalities – Find the voice that motivates you WHO IT'S FOR • Beginners learning proper form • Lifters who want real feedback, not guesswork • Anyone serious about injury prevention • People who hate clunky workout apps PRIVACY FIRST Your videos are processed securely and never shared. Start training smarter. Download Flexion. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.flexionapp.com/privacy

About

Soln

Features
Read full description

Soln is a sleep engine built on cognitive load theory. Different from other sleep apps Most sleep apps are just players — they start audio and leave you to it. Soln calculates how hard it will be to fall asleep tonight, decides which layer to start at and how long to stay there, then stops when you're out. You don't have to manage anything. Five audio layers · Silent preparation — nothing playing, just space for your mind to settle · Minimal white noise — a steady background to mask outside noise · Heart rate-synced white noise — audio tempo follows your heart rate; as it slows, so does the sound · Tonal fade — frequency gradually drops, sliding your brain from alert to relaxed · Semantic drift — soft, loosely connected speech that gives your mind something to dissolve into instead of looping the same thought (paid) How long you spend on each layer isn't fixed — it depends on how you're doing tonight. Apple Watch auto-stop When you fall asleep, Apple Watch detects it. Soln fades the audio out over two seconds, then stops. No timer to set. No sudden silence to wake you (paid). Nightly assessment Before bed, based on today's mood and last night's sleep, Soln estimates how hard it'll be to fall asleep and gives you an optimal bedtime window and expected sleep onset time. In the morning, three scores: reaction, memory, and mood. Sleep well, score well. Sleep poorly, score reflects that. Straightforward. Full sleep history A three-color ring for each night. Long-press any day for that night's detail and sleep-onset timeline. One-time purchase Free for 7 days, full features included. After that, a one-time purchase permanently unlocks everything. Tied to your Apple ID — restore on any new device. No ongoing charges.

Screenshots

Flexion4 screens
Soln4 screens

Verdict

The call

The clearest difference is iOS requirement: Flexion at 15.1 against Soln's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flexion sells 2 in-app purchases, starting at $9.99 per month and Soln sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Flexion ships an update fortnightly, Soln every 3 weeks. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.

Scorecard1 real difference · 9 level
Flexion versus Soln: the parameters behind the verdict, then further details
ParameterFlexionSoln
PriceFreeFree
Rating4.4 (7 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings7 — better—
Update frequencyFortnightly — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad, Apple Watch — better
Requires iOS15.1 — better17.0
Further details — not scored
Size62 MB3 MB
Age rating4+4+
DeveloperAgastya AhluwaliaNan Yu

In-app purchases

2 purchases

Flexion

Subscriptions2
  • Premium Monthly$9.991 Month
  • Premium Yearly$59.991 Year
1 purchases

Soln

One-time1
  • Unlock Soln$5.99

Questions

Is Flexion free?
Flexion is free to download, with in-app purchases available.
Is Soln free?
Soln is free to download, with in-app purchases available.
Do Flexion or Soln have ads?
Neither Flexion nor Soln shows ads.
Which is updated more often, Flexion or Soln?
Flexion ships an update fortnightly, and Soln every 3 weeks. Most recently, Flexion was updated on October 24, 2026 and Soln on October 13, 2026.

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