The Best Height Predictor Apps, Honestly Compared

How we compared

Every app got scored on the same five questions, all answerable from public listings:

1. Is the prediction result free — or does a paywall appear after the quiz?
2. Is the prediction method published — a formula you can check, or a black box labeled "AI"?
3. Is pricing transparent — one price, or many simultaneous prices for the same plan (A/B price testing)?
4. What does the privacy label say — trackers, data sharing, and whether your data can be deleted?
5. What do 1–2★ reviews complain about — billing surprises, refund support, broken features?

The comparison table

Sources: public App Store / Google Play listings · Last checked July 14, 2026. Price ranges reflect multiple simultaneous SKUs for the same plan (price testing), so the offer you see may differ.

1. GoTaller — the free-prediction one (ours)

Our position in this list is simple: the prediction should be free, because it isn't secret science. GoTaller gives you the predicted adult height with an honest range and your height percentile at no cost — in the app and in a browser calculator that doesn't even need an install. The method (WHO growth references + mid-parental height, with the uncertainty band widening the younger you are) is documented on the tool page, so you can check our work — we think we're the only app in this table you can say that about. No ads, no third-party trackers, and your data can be deleted in-app.

The paid part ($5.99/week, $24.99/year with a 3-day free trial, or $34.99 lifetime) is the daily habit plan: sleep target for your age, tap-to-log growth foods, one guided posture exercise a day, and trend-aware height tracking. Who it's for: anyone who wants the number and the percentile without a paywall — and a habit plan that doesn't oversell what habits can do. Fair reasons to pick a rival instead: we're new (no six-figure rating count yet), and our exercise library is 19 guided videos, not 100+.

2. GoTall — the most popular one

The category leader by installs (100K+ on Play, 4.6–4.8★ across stores), actively updated, professionally built. Its science framing — CDC data, parental height, puberty stage — is the right family of approach, though the formula itself isn't published. The catch is placement: the result appears only after subscribing ($1.99–5.99/week or $9.99–59.99/year depending on which offer you're shown), and its Play data-safety label states collected data "can't be deleted." Billing complaints ("charged $39 instead of the advertised $0.67") and slow refund support are the recurring 1★ themes. Who it's for: someone who wants the most established app with deep tracking features and is comfortable paying before seeing the result. Full breakdown: our GoTall review.

3. Taller — the coaching library

The original "get taller" subscription app (reportedly ~$70K/month in revenue) and the strongest actual product content: 100+ categorized exercises, routines, an AI coach, and community features. The prediction is a black box wrapped in "HGH production" language, its site's "98.5% Accurate" claim has no published source, and the result sits behind the paywall — but as a paid posture-and-habits program, there's real substance. Who it's for: someone who wants coached routines and will actually use them; the subscription buys the coaching wrapper, not secret height science. Full breakdown (including the two other apps named "Taller"): our Taller review.

4. Taller AI — the expensive one

Confusingly, a different company (Leadimize Inc) than Taller above — and the priciest option in the table: up to $9.99/week or $99.99/year, no lifetime tier. 21K ratings at 4.7★, but the 1★ reviews are the sharpest in the category: auto-renewal charges ("$44"), the app freezing after you enter measurements until you subscribe, and no website beyond a privacy policy hosted on Google Sites. The prediction method is "AI," full stop. Who it's for: honestly, hard to say — everything it does, one of its rivals does cheaper or more transparently.

5. Taller App by Growth Hack — the small third "Taller"

The third app to use the Taller name (GreatFit, Inc.; 445 ratings). Sells "Growth Hack Pro" with the widest simultaneous price spread we found for identical plans — two different prices for "Lifetime" ($14.99 and $19.99), two for annual ($49.99 and $59.99) — plus diet tracking with "AI calorie analysis." Method unpublished. Who it's for: no obvious niche; if you want a Taller-style program, the bigger Taller has more content for similar money.

6. Max Taller — the other free prediction

Credit where due: Max Taller's listing states the height predictor tool itself is free, with the subscription covering exercise tracking, 3D guides and meal tracking. Two honest cautions. First, the marketing yells "GROW TALLER AFTER PUBERTY!" — the kind of claim the fine print of every app in this table quietly walks back. Second, its privacy label declares precise location collection used to track you across other apps — unusual for an app whose job is arithmetic about your height. 4.8★ but only 29 ratings; 8+ simultaneous price SKUs from $4.99 to $24.99. Who it's for: someone who wants a free in-app prediction and doesn't mind the tracking profile.

7. HeightGPT — the stale one

A ChatGPT-branded-sounding predictor ("AI-Powered Height Predictions") that hasn't been updated in over a year on either store, shows no prices publicly anywhere in its listing, and has 15 iOS ratings — of which the visible reviews claim things like going from 5'8" to 6'3", with the same reviewer name appearing twice. We can't call reviews fake from the outside; we can say the pattern is exactly what incentivized reviews look like. Privacy label: collects sensitive data, used for cross-app tracking. Who it's for: we'd skip it.

8. GrowMaxx — the renamed one

Formerly listed as "GoTaller — Height Predictor" (no relation to us — see the name untangling), renamed GrowMaxx on the App Store. Its store screenshots advertise "optimize up to 7.0 cm" — the boldest monetized centimeter-promise in the category — and its in-app purchases are literally named "1 Week Height Increase" ($4.99–7.49). On Play, its data-safety label declares data isn't encrypted and can't be deleted. Age rating 18+, method unpublished. Who it's for: nobody we'd recommend; its own reviews call it a knockoff.

Best height predictor for a child

If you're a parent, skip the subscription apps entirely — they're built to convert insecure teens, not to inform you. For a child, two published methods cover it: the mid-parental (Tanner) formula — add the parents' heights, adjust ±5.1 in (13 cm) for sex, divide by two — and a percentile check against WHO/CDC growth references for your child's exact age and sex. Our free child height predictor runs both in the browser, with the formula printed on the page and nothing stored. (A minimal free option on Android is "Height Prediction" by Ecliptic App Ventures — parents' heights in, estimate out, no purchases, though its "machine learning" label is likewise unexplained.) If a child is crossing percentile lines downward or puberty timing seems far off typical, that's a pediatrician question, not an app question.

Why every app hides your result behind a paywall

Once you've seen the numbers, the pattern explains itself. Weekly subscriptions at $4.99–9.99 against a quiz that costs nothing to run; multiple simultaneous prices for identical plans to find each user's maximum; the result — the single thing you came for — held back as the conversion trigger. The Taller app alone reportedly clears ~$70K/month on this funnel. It works because the quiz manufactures sunk cost: ten minutes of answering questions makes the subscription screen feel like the last step rather than the first ask. That's also why the top complaint on every one of these apps is the same sentence — "I answered everything and it wants money to show my result." The result is cheap to compute. The anticipation is the product.

How accurate are any of these?

Short version: no paid app in this table publishes its method, so their accuracy claims are unfalsifiable — and the honest ceiling for any method is a range, not a promise. A proper answer needs its own page: how accurate are height predictors, really?

FAQ

What is the best free height predictor app?

Only two of the eight apps we compared show the prediction without payment: GoTaller (prediction and percentile free, in the app and on the web) and Max Taller (prediction free per its listing, paid tracking features). The other six — including the most popular ones — require a subscription before showing your result. Full disclosure: GoTaller is our app; the comparison criteria are listed openly on this page.

What is the most accurate height predictor app?

Unknowable as asked: none of the paid apps publishes its prediction method or a validation study, so their accuracy claims can't be checked. The honest ranking is by method transparency — a predictor that shows its formula (growth-reference percentiles plus mid-parental height) lets you judge the estimate; a black box doesn't. No method can tell you exactly when you'll stop growing.

Do height predictor apps work?

The prediction part can work as a statistical estimate — the underlying science (growth charts, parental height) is real and gives a range, not a guarantee. The "grow taller" part is habit coaching: sleep, posture and nutrition support normal growth, and posture work can reclaim 1–3 cm of slouched height, but no app can lengthen bones after growth plates close.

What's the best height predictor for a child?

For parents, a calculator beats a subscription app: the mid-parental (Tanner) method needs only the parents' heights, and a percentile check needs age, sex and current height. Our free child height predictor runs both in the browser with the formula shown. For concerns about a child's growth — dropping across percentile lines, very early or late puberty — see a pediatrician rather than an app.

Are height predictor apps worth paying for?

Not for the prediction — that math is published science and available free. Paying can make sense for the coaching wrapper (routines, reminders, exercise libraries, community) if you'll actually use it. Watch weekly pricing: $5.99/week is over $300/year if you forget to cancel.

Deep dives: GoTall review · Taller review (all 3 "Taller" apps) · How accurate are height predictors?