Sterk. vs FlexFrame
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sterk.
Effortlessly log your exercise sets with intelligent predictions and review comprehensive statistics for each movement and training session. This streamlined application is designed to help you achieve your fitness objectives.
- Smart set prediction
- Detailed exercise stats
- Workout logging
- Intuitive interface
- Fitness goal tracking
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Sterk makes tracking your workouts easy. Log your sets quickly with smart set prediction and check out detailed stats for every exercise and workout. It’s minimal, intuitive, and designed to help you stay on top of your fitness goals. Terms of Use (UELA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sterkapp.github.io/privacy-policy/
FlexFrame
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FlexFrame turns your camera into a transformation time machine. Whether you're tracking a body recomposition, a home renovation, a garden growing, or any long-term project - FlexFrame makes sure every photo lines up perfectly so your time-lapse looks cinematic. HOW IT WORKS 1. Create a project - "Summer Cut", "House Build", "Plant Growth" - anything you want to document over time. 2. Take a photo each day. FlexFrame helps you nail the exact same position every time. 3. Export a time-lapse video and watch your transformation unfold. KEY FEATURES Ghost Overlay (Onion Skin) Your last photo appears as a semi-transparent guide over the live camera feed. Line up your body, align the frame - consistency becomes effortless. Gyroscope Leveler A live level line turns green the moment your phone is perfectly straight. No more tilted angles ruining your progress video. Time-lapse Export Stitch every photo into a smooth video. Control the playback speed and overlay your data labels (weight, day count, notes) directly onto the footage. Project Organisation Manage multiple goals at once. Your dashboard shows each project's photo count, days elapsed, and a cover thumbnail at a glance. Fully Offline No account required. No cloud sync. Everything stays on your device. PERFECT FOR - Fitness & body transformation (cuts, bulks, recomps) - Home renovation & DIY documentation - Plant & garden growth - Pregnancy journeys - Before & after comparisons - Any long-term visual project PRICING FlexFrame is completely free. No paywalls, no subscriptions, no watermarks. Start documenting your journey today. Download FlexFrame.
Screenshots
Verdict
The clearest difference is iOS requirement: Sterk. at 16.4 against FlexFrame's 18.2. On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Sterk. | FlexFrame |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (5 ratings) — better | — |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 3 weeks | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.4 — better | 18.2 |
| Further details — not scored | ||
| Size | 76 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Theodor Corne Rooskens | ZARZARA SOFT, SRL |
In-app purchases
Sterk.
No in-app purchases
FlexFrame
No in-app purchases









