WeightUp vs Gain Weight
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
WeightUp
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WeightUp is a weight gain app for people who eat and eat but still can't put on weight. Snap a photo of your meal and AI estimates the calories for you. WeightUp builds a weight gain plan around your body and lifestyle, so you always know how much to eat, without tedious food logging. WHAT YOU CAN DO β’ Snap a meal photo and get an AI calorie estimate in seconds β’ Get a personalized weight gain plan based on your age, height, weight, and activity level β’ See today's calories on a chart and track your progress toward your daily goal β’ Set a target weight and date, and gain at a steady, healthy pace β’ Get meal ideas that fit your calories per meal, so you never have to wonder what to eat β’ Turn on mealtime reminders so you don't skip a meal WHY WEIGHTUP β’ Just snap a photo. Logging takes seconds, so it's easy to keep going β’ Built only for gaining weight, so you see what you need and nothing else β’ Your plan is based on the Harris-Benedict equation, a well-established formula for estimating calorie needs β’ Small daily wins add up to real change GREAT FOR YOU IF β’ You eat a lot, but the scale won't move β’ You want to bulk up and support your training β’ You're underweight and want a healthier, stronger body Start today and take your first step toward the body you want. SUBSCRIPTION WeightUp offers an optional auto-renewing subscription, WeightUp Premium. Payment is charged to your Apple Account when you confirm your purchase. Your subscription renews automatically unless you cancel it at least 24 hours before the end of the current period. You can manage or cancel your subscription in your Apple Account settings. Privacy Policy: https://www.notion.so/2811ae37949a806ab699ff66706f5083?pvs=21 Terms of Use: https://www.notion.so/WeightUp-2811ae37949a80fa896fc8f4e7930e0f?pvs=21 Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ WeightUp provides general health and wellness information and is not a medical device. If you have any health concerns, talk to a doctor or healthcare professional.
Gain Weight
This app helps users track calorie intake specifically for gaining weight and muscle mass. It offers quick meal logging via photo recognition and provides personalized targets based on user stats and goals. Data is kept private on the device with optional iCloud sync.
- Bulk-first calorie targets
- AI-powered photo meal logging
- One-gesture logging for weight and portions
- Clear home screen with daily progress
- Trend-based weight tracking
- Privacy-focused, no account needed
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StackCal is the calorie tracker built for bulking, not cutting. Most nutrition apps assume you're trying to lose weight. StackCal flips the script. If you're trying to gain muscle, gain mass, or just stop under-eating, StackCal answers the one question that actually matters: "How much more do I need to eat today?" WHY STACKCAL - Bulk-first targets β Personalized BMR, TDEE, and surplus calculations based on your stats and goals. - 5β10 second logging β Snap a photo of your meal and let AI recognize the food and estimate calories. No barcode scanning, no database fumbling. - One dial for everything β Log weight and adjust portion sizes with the same analog dial. One gesture to learn. - Nothing hidden β Today's calories, what you ate, and your weight all live on the home screen. - Trend-based weight β See your moving average instead of fighting daily fluctuations. DESIGNED FOR CLARITY Three rules guide every screen: information is never hidden, the same gesture always means the same thing, and every tap produces a visible response. The result is an app you can use one-handed, post-workout, with sweaty fingers. PRIVACY FIRST - No account required. - Your meals, weight, and profile stay on your device. - Optional iCloud sync uses your private CloudKit container β we never see your data. - No ads. No IDFA. No tracking pixels. SUBSCRIPTION A free tier covers core logging. The subscription unlocks photo-based food recognition and advanced trend analysis. Cancel anytime in iOS Settings. Built for lifters who eat to grow. TERMS OF USE Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Gain Weight at daily against WeightUp's weekly. Gain Weight also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. WeightUp sells 2 in-app purchases, starting at $3.99 per 7 days and Gain Weight sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
WeightUp ships an update weekly, Gain Weight daily. The most recent releases landed on October 16, 2026 and October 2, 2026 respectively.
| Parameter | WeightUp | Gain Weight |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Daily β better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | β | Freemium |
| Devices | iPhone, iPad β better | iPhone |
| Requires iOS | 26.0 | 17.0 β better |
| Further details β not scored | ||
| Size | 8 MB | 17 MB |
| Age rating | 17+ | 4+ |
| Developer | Jimpei Yamamoto | Moo & Company |
In-app purchases
WeightUp
- γγ¬γγ’γ 1ι±ι$3.997 Days
- γγ¬γγ’γ 1γΆζ3 Days trial$6.991 Month
Gain Weight
- StackCal Pro ζι‘γγ©γ³7 Days trial$9.991 Month
- StackCal Pro εΉ΄ι‘γγ©γ³7 Days trial$49.991 Year








