Tou Calo

Written by Tou Calo Nutrition Team · Vulcan Labs · Updated August 2026. App features and pricing verified against official App Store listings. Tou Calo is published by Vulcan Labs — we include it in this list and have noted this clearly.

A weight gain app helps you eat enough — consistently, not just occasionally. The challenge with gaining weight is not a single big meal but hitting a calorie surplus every day across busy schedules, low-appetite mornings and weekends when routine breaks down. The right app makes your daily surplus target visible and shows whether you are actually hitting it. This guide ranks 6 weight gain apps by use case — clean bulk, dirty bulk, beginners and muscle gain — with honest notes on what each does well and where each falls short.

Quick picks:
Fastest logging: Tou Calo (AI photo, free iOS) · Best for clean bulk: MacroFactor · Best for beginners: MyFitnessPal · Most accurate data: Cronometer · Best meal planning: Fitia
Find your calorie surplus target first — use our TDEE calculator and BMR calculator before choosing an app.

In this guide

1. What to look for in a weight gain app
2. Quick comparison — 6 apps
3. Each app reviewed
4. Clean bulk vs dirty bulk — which app fits
5. FAQ

What to look for in a weight gain app

The biggest gap across free apps is the absence of gaining-specific features. Most apps treat weight gain as just “set a higher calorie goal” without adjusting the user experience — no calorie floor alerts, no surplus visualisation, no guidance on hitting your target when you are behind. With this in mind, the features that actually matter for weight gain are:

• Calorie surplus visibility: Can you see at a glance whether you are hitting your surplus today, or only after adding up manually?
• Protein target tracking: Muscle gain requires 1.6–2.2g protein per kg of bodyweight — the app should make this target visible, not just total calories.
• Fast logging: When you are eating 5–6 times a day in a bulk, logging friction is the main reason people stop tracking. AI photo logging, barcode scanning or saved meals all reduce this friction.
• Adaptive targets: As you gain weight, your TDEE increases — your calorie target needs to increase too. Apps that adjust targets based on weight trends are more useful for longer bulks.

Quick comparison — 6 weight gain apps

Each app reviewed

1. Tou Calo — best for fast logging during a bulk (iOS, free)

When you are eating 5–6 times a day in a bulk, logging speed is the primary variable that determines whether you actually track consistently. Tou Calo’s AI photo logging reads your meal from a photo and returns calories, protein, carbs and fat in approximately 3 seconds — no barcode scanning, no manual food search, no database navigation. For high-volume meals that would take several minutes to log manually (a bowl of rice, chicken and vegetables with sauce), a single snap handles the entire entry.

The free tier includes full AI photo logging, daily macro totals, calorie surplus tracking and meal history. You set your calorie surplus target manually using your TDEE as a baseline — our TDEE calculator gives you this number. Tou Calo is iOS only and is published by Vulcan Labs, the same team that publishes this article.

Best for: Anyone eating high-volume meals who wants to log without friction.
Free tier: Full AI photo logging, macro tracking, surplus visibility — no paywall on core features.
Limitation: iOS only. Targets are set manually rather than adapting automatically to weight changes.
Platform: iOS

2. MacroFactor — best for clean bulk precision

MacroFactor is the most analytically rigorous calorie tracker available for serious lifters in 2026. Its core feature is an adaptive algorithm that calculates your real-world TDEE based on your actual weight trend and food intake data, rather than relying on standard metabolic estimates. Over time, it adjusts your calorie targets as your metabolism responds to training and body weight changes — directly relevant for maintaining a clean bulk over several months.

If you are gaining too quickly, MacroFactor pulls the surplus back. If your weight trend is flat, it increases your target. This feedback loop is the most important feature for a controlled, lean bulk — it removes the guesswork from monthly target adjustments.

Best for: Serious lifters doing a controlled clean bulk who want adaptive macro coaching.
Free tier: Time-limited trial — full subscription is $11.99/month or $59.99/year.
Limitation: No AI photo logging. Requires consistent daily weigh-ins for the adaptive algorithm to work well.
Platform: iOS and Android

3. MyFitnessPal — best for beginners

MyFitnessPal’s primary advantage is its food database — the largest available, covering regional brands, restaurant items and homemade recipes across most markets. For a beginner starting their first bulk who eats a wide variety of foods and needs to find entries for almost anything, MyFitnessPal’s database reduces the friction of starting from scratch.

Setting a calorie surplus goal is straightforward — enter your current weight, goal weight and activity level, and the app sets a daily calorie target. The limitation is that this target does not adapt as you gain weight; you need to manually recalculate your TDEE and update your goal every 4–6 weeks.

Best for: First-time bulkers who need a large food database and simple goal setup.
Free tier: Basic calorie and macro tracking; advanced features behind Premium ($19.99/month).
Limitation: Non-adaptive targets. User-submitted database contains inaccurate entries.
Platform: iOS and Android

4. Cronometer — best for clean bulk data accuracy

Cronometer’s staff-verified food database is the most accurate available across general-purpose calorie trackers. For a clean bulk where food quality and micronutrient adequacy matter — not just hitting a calorie number — Cronometer’s detailed breakdown of vitamins, minerals and amino acid profiles is the strongest in the category. Every database entry is verified, eliminating the inaccurate user-submitted entries that undermine MyFitnessPal’s reliability.

Best for: People doing a nutrient-dense clean bulk who want verified food data and micronutrient tracking.
Free tier: Full nutrition tracking including micronutrients — one of the most generous free tiers available.
Limitation: No AI photo logging. No adaptive targets. Interface is data-dense and less beginner-friendly.
Platform: iOS and Android

5. Fitia — best for meal planning

Fitia is a user-friendly nutrition app that combines AI-powered meal planning with robust calorie and macro tracking, making it a strong choice for people who want a personalised approach to nutrition. For weight gain specifically, its meal planning feature generates high-calorie meal ideas and grocery lists based on your surplus target — useful for people who struggle to eat enough not because of appetite but because they run out of ideas for calorie-dense meals.

Best for: People who need meal plan guidance and recipe ideas to consistently hit a calorie surplus.
Free tier: Limited — most meal planning features require Premium.
Limitation: Adaptive targeting is limited. Primarily useful for the meal planning component.
Platform: iOS and Android

6. Lose It! — best for simple general tracking

Lose It! supports weight gain goals — you set a target weight above your current weight and it calculates the required calorie surplus. Its clean interface and fast food database make it one of the most user-friendly general trackers. The limitation for weight gain is the same as for weight loss: targets are static, net carb display requires Premium, and the meal planning tools are limited compared to dedicated bulking apps.

Best for: People who want a clean, simple tracker for general calorie surplus tracking.
Free tier: Basic calorie tracking; macro details and advanced features behind Premium (~$39.99/year).
Limitation: No adaptive targets, no weight-gain-specific features beyond goal setting.
Platform: iOS and Android

Clean bulk vs dirty bulk — which app fits

Dirty bulking means eating in a large surplus (500–1,000+ kcal/day) without much attention to food quality — it produces fast weight gain but with a high fat-to-muscle ratio. Clean bulking means eating in a controlled surplus (200–400 kcal/day) with emphasis on protein adequacy, nutrient density and meal timing.

Before choosing an app, calculate your surplus target. Use our TDEE calculator to find your maintenance calories, then add 200–400 kcal for a clean bulk or 400–600 kcal for a faster bulk. Use our BMR calculator to understand your resting baseline. Knowing your number before opening an app makes every other decision clearer.

Weight gain app — FAQ

What is the best free weight gain app?

For free AI photo logging with no paywall, Tou Calo (iOS) is the strongest option — you can snap any meal and get calories and macros without manual entry on the free tier, which is particularly useful when eating high-volume meals multiple times a day during a bulk. Cronometer offers the best free tier for manual logging with verified food data. Most free apps treat weight gain as just setting a higher calorie goal without gaining-specific features — so the best free option depends on whether logging speed or data accuracy matters more to you.

How does a weight gain app help you gain weight?

A weight gain app makes your daily calorie surplus visible and trackable. The primary cause of failed bulks is not eating enough consistently — not in any single meal, but across a full week including busy days, low-appetite mornings and social meals where portions are harder to estimate. An app shows your running daily total, makes it clear when you are falling short before the day ends and records your meal history so you can see patterns over time. Use our TDEE calculator to set your surplus target before choosing an app.

What is the best weight gain app for muscle building?

The best calorie tracking app for muscle building in 2026 is one that supports a dedicated muscle gain mode with automatic calorie surplus and protein target setting. For adaptive precision during a multi-month bulk, MacroFactor’s algorithm-based target adjustment is the strongest available. For fast daily logging of the high-volume meals that muscle building requires, Tou Calo’s photo logging removes the friction that causes most people to stop tracking. Protein target visibility is the most important feature — aim for 1.6–2.2g per kg of bodyweight daily.

How much of a calorie surplus do I need to gain weight?

A surplus of 200–400 kcal per day above your TDEE supports a clean bulk — approximately 0.2–0.4 kg per week of weight gain, with a higher proportion being muscle. A surplus of 400–600 kcal supports faster weight gain at approximately 0.4–0.6 kg per week, with a higher proportion being fat. Larger surpluses above 600 kcal/day (dirty bulk) produce faster scale weight increases but most of the additional gain is fat rather than muscle. Use our TDEE calculator to find your maintenance calories first, then add the appropriate surplus.

Do weight gain apps work for skinny people who struggle to eat enough?

Yes — but the most useful feature for people with low appetites is meal planning and calorie-dense food suggestions rather than just tracking. Fitia’s AI meal plan generation is specifically useful here because it creates high-calorie meal ideas rather than leaving you to find calorie-dense foods yourself. Tou Calo’s photo logging reduces the effort of tracking what you do eat, making it easier to maintain consistency. The underlying issue for most underweight people is not knowing what to eat to hit their surplus — a meal planning app addresses this more directly than a pure tracking app.

Disclosure: Tou Calo is published by Vulcan Labs, the same team that publishes this article. All other apps listed are third-party products included on the basis of category relevance. App features and pricing are based on publicly available information as of August 2026 and may change.

Written by Tou Calo Nutrition Team — Vulcan Labs
The team behind Tou Calo AI Calorie Counter.

Related tools:
BMR Calculator — your resting calorie baseline
TDEE Calculator — your total daily calorie burn
Calorie Deficit Calculator — understand your deficit vs surplus
Body Fat Calculator — track lean mass vs fat mass over time