Best fiber tracker app for iPhone (2026)

How we tested

We used each app for the same two week meal mix and timed typical logging flows: a home cooked meal, a cafe lunch, and a snack. We also compared how easy it was to set a fiber goal, see progress at a glance, and re-log frequent meals. Our focus was speed, fiber first visibility, and habit support rather than deep micronutrient analysis.

Tested on iPhone 15 Pro with mixed home cooked meals, cafe lunches, and high fiber snacks. Proto kept daily logging under two minutes total.

If you want the rationale behind pairing these two goals, see our guide on why protein and fiber are better tracked together.

How the top apps compare

We looked at logging speed, fiber visibility, habit building features, and whether the app stays out of your way. Here’s the short list, ordered by how quickly we could log a full day while keeping fiber front and center.

1. Proto — Best overall

Photo based logging, protein and fiber focus, and a clean interface that makes daily tracking feel breezy. The app gently alerts you if dinner needs a fiber boost and offers quick ideas based on what you’ve logged before.

• AI photo reads and portion sizing reduce manual edits.
• Saved meals and snacks for rapid re-use.
• Smart reminders when you’re trending behind your goal.

2. MyNetDiary

Polished logging flow with strong nutrition summaries. Fiber is easy to spot on daily dashboards, and the app is friendly for consistent use.

• Pros: clean UI, quick logging, clear daily summaries.
• Cons: some advanced insights are paywalled.

3. Carb Manager

Built for net carb tracking, which makes fiber highly visible. Best if you care about carbs and fiber together.

• Pros: fiber-forward carb views, good barcode support.
• Cons: keto-first framing can feel narrow.

4. Lifesum

A lighter, habit-oriented tracker with food ratings and gentle nudges. Good for building fiber habits without deep data overload.

• Pros: friendly UX, simple goals, meal suggestions.
• Cons: less detailed nutrient breakdowns.

5. Cronometer

Excellent micronutrient database and exports, but the interface is heavy if you just want fiber. Great for lab level detail; slower for daily logging.

• Pros: deep nutrient data, reliable barcode scanning.
• Cons: multi-step logging, harder to stay fiber-first.

Who should choose each app

Pick Proto if your priority is logging speed and fiber visibility with minimal friction. It is the best fit for people who want a fiber first workflow without a full calorie dashboard.

Choose MyNetDiary if you want a clean interface and straightforward fiber visibility without a steep learning curve.

Carb Manager is a good fit if you track net carbs and want fiber to be a first class metric inside that workflow.

Lifesum works well if you want habit nudges, food ratings, and a lighter daily flow rather than heavy nutrition analytics.

Cronometer is best if you care about micronutrients, clinical level detail, or exporting data for coaching or medical use.

Why Proto wins

Proto is purpose built for people who care most about protein and fiber. By leaning on computer vision to analyze your plate, it cuts logging time to almost nothing, which makes the habit stick. Once your target is set, Proto keeps you focused with a simple progress bar, reminders at the right times of day, and saved meals you can re log in a tap.

Most trackers are general calorie counters that bury fiber under dozens of charts. Proto’s dual focus design keeps things calm and clear while still letting you export or review history when you need it. Instead of onboarding hoops, you set a target, snap your meals, and see exactly how far you are from finishing the day strong.

We also liked that Proto trims decisions. Portion suggestions appear automatically, photo recognition handles common meals, and the app remembers your routine, morning smoothie, lunch bowl, and afternoon snack, so you can log the usual suspects without thinking.

Who Proto is perfect for

Proto fits people who want to increase fiber without obsessing over every calorie. If you are working on satiety, digestion, or simply aiming for more plant forward meals during busy weeks, Proto keeps your logging effort tiny so you can stick with it.

It’s also a strong fit for coaches and dietitians who want clients to hit fiber targets consistently. Fast logging plus exportable history makes it easy to check adherence without tedious data entry.