The 7 Best Weight Gain Apps in 2026 (Tested by a Hard Gainer)

Search for the best weight gain apps and you’ll mostly find lists written for people trying to lose weight, with “gain” bolted on at the end. That’s backwards. If you’re a hard gainer, the app you need is not a diet app running in reverse - it’s a tool built around the opposite problem.

This list was tested by an actual hard gainer - someone who has stared at a half-finished plate at 9pm, 800 calories behind target. Every app below was judged on one question: does it help you eat more, or does it quietly assume you want to eat less?

How these apps were judged

Most calorie trackers were designed around deficit. The food database is neutral, but the psychology is not - red numbers when you go over, celebrations when you stay under, streaks built around restraint. For a gainer, that’s exactly inverted. If you’re not sure why gaining is so hard for you in the first place, start with why you can’t gain weight - then pick your tool.

• Surplus psychology: going over target should feel like winning, not failing.
• Logging speed: every extra tap is friction, and friction kills low-appetite days.
• Help when behind: the best apps do something useful at 6pm when you’re 900 calories short.
• Honest math: sane calorie targets and realistic gain rates (0.25-0.5% of bodyweight per week).

The 7 best weight gain apps in 2026

1. klyo - best if you can’t eat enough

klyo is built for exactly one person: someone who wants to gain weight but runs out of appetite, time, or memory before they hit their number. It sets your daily calorie target with the Mifflin-St Jeor formula, lets you log by snapping a photo of your plate or typing a sentence, and - the important part - steps in when you’re behind. “Top Up” suggestions tell you exactly what to eat to close the gap, Quick Wins ranks fast snacks by calorie density, and the AI coach reads your real logging data instead of reciting generic advice.

Honest limits: it’s iOS only, it’s a young app, and it’s the wrong tool if your goal is weight loss. If you want micronutrient breakdowns or the biggest database on earth, look further down this list. There’s a free tier (your target, manual logging, Quick Wins, a limited coach); Pro is $59.99 a year with a 7-day free trial, or $9.99 a month.

Best for: hard gainers, ectomorphs, and busy people who under-eat by accident.

2. MacroFactor - best for data nerds

MacroFactor’s signature feature is adaptive TDEE: it watches your weight trend against your logged intake and adjusts your calorie target weekly, so your surplus stays a real surplus as your body adapts. Logging is fast, and the tone is refreshingly judgement-free - no red numbers, no guilt mechanics.

The trade-offs: it’s subscription-only with no permanent free tier, and it’s a calculator rather than a coach - it will tell you the number, but it won’t chase you to hit it.

Best for: lifters running a long, periodised bulk who love graphs and trust the process.

3. MyFitnessPal - best food database

MyFitnessPal has the biggest food database in the category, covering branded products, restaurant chains, and millions of user entries, plus a barcode scanner (now part of the paid Premium layer) that almost always hits. If your bulk leans on packaged foods and eating out, nothing matches it for coverage.

The catch is its DNA: the defaults, warnings, and progress framing are built around eating less. Going over your goal reads as failure - which, on a bulk, is exactly the wrong signal.

Best for: people who eat lots of branded and restaurant food, or anyone who also cycles through cutting phases.

4. Cronometer - best for micronutrients

Cronometer’s database is built on verified sources rather than user submissions, and it tracks dozens of micronutrients alongside calories and macros. If you want to know your zinc, iron, or B12 intake - not just your protein - it’s the clear pick, and there’s a capable free tier.

For a pure “eat more” goal, that level of detail can be overkill, and the interface feels more lab than locker room.

Best for: plant-based gainers, medical diets, and anyone who genuinely cares about micros.

5. BulkMode - best gain-only alternative

BulkMode is one of the newer apps built exclusively for weight gain: AI meal scanning, targets that recalculate as you progress, and no warnings for eating “too much.” The gain-first framing is real, not a re-skinned diet app.

As a newer entry, the ecosystem is smaller and the feature set is still filling out - but it’s encouraging to see more tools take gaining seriously.

Best for: bulkers who want gain-only framing in a simple, focused tracker.

6. Vulk - best for guided ectomorph plans

Vulk speaks directly to skinny guys, hard gainers, and ectomorphs, with a plan-driven approach to gaining rather than a blank logging screen. If you want more hand-holding than a bare tracker provides, the structure helps you start.

There’s a free trial but no permanent free tier, and like BulkMode it’s early in its life - expect rough edges alongside the focus.

Best for: ectomorphs who want a guided plan and don’t mind paying for one.

7. Eat This Much - best for meal planning

Eat This Much works the other way around: instead of logging what you ate, it generates meal plans and grocery lists to hit your calorie target. For people who would rather follow a plan than make food decisions all day, that’s a genuine superpower. Basic planning is free; the deeper features are paid.

A plan is not a log, though - it assumes you’ll cook and follow it, and it won’t catch the days you quietly don’t.

Best for: planners who want decisions made in advance. Pairs well with a tracker.

Which one should you pick?

• You can’t finish your calories: klyo.
• You want adaptive targets and beautiful graphs: MacroFactor.
• You live on barcodes and restaurant food: MyFitnessPal.
• You care about micronutrients: Cronometer.
• You want gain-only framing in a different flavour: BulkMode or Vulk.
• You want the thinking done in advance: Eat This Much.

Two of these also combine well: Eat This Much for deciding what to cook, plus a gain-focused tracker for catching what actually happened. What doesn’t work is app-hopping - switching trackers every two weeks resets the only thing that matters, which is your streak of logged days.

The bottom line

Any of these apps can work if you actually use it daily - the best app is the one that survives your worst week. Before you commit to one, get your numbers right with the calorie surplus calculator, and if you’re planning a clean run at this, the lean bulk guide covers the full playbook.

Pick one, set the target, and let consistency do the heavy lifting.