# Surest vs Tidemark

The clearest difference is in-app purchases: Surest at none against Tidemark's 3. Surest also leads on ratings volume (6.5K vs 1). Tidemark's advantage is rating (5.0 vs 4.6) and update cadence (every 9 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Tidemark sells 3 in-app purchases, starting at $0.99 per 7 days. Surest asks for nothing beyond the download.

Tidemark holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Surest has 6.5K ratings behind it against 1, so its average is the more settled of the two.

Surest ships an update every 3 weeks, Tidemark every 9 days. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Surest | Tidemark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (6.5K ratings)](https://appshunter.io/ios/app/surest/id1283152937/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tidemark-hydration-guide/id6772892443/reviews)** |
| Number of ratings | **6.5K** | 1 |
| Positive reviews | 14.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 9 days** |
| Monetization | **Free** | Freemium |
| Size | 94 MB | 4 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Bind Benefits, Inc](https://appshunter.io/developer/1283152936) | [Sukhleen Kaur](https://appshunter.io/developer/1896281222) |

## What reviewers say

### Surest

[App page](https://appshunter.io/ios/app/surest/id1283152937)

Compare prices for doctors and health services to find savings. View copays in advance, access your digital ID card, and track claims. This plan offers no deductible and access to a broad national network.

**Highlights:** Compare doctor and service prices, See clear copays in advance, Access digital ID card, View current claims information, No deductible, Access UnitedHealthcare network

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Clear, affordable
- 🚀 Intuitive health insurance
- 🚀 Easy to use
- 🚀 Helpful and intuitive
- 🚀 Great info on provider cost

**What reviewers complain about**

- 🐛 Freezes and incorrect copay
- 🐛 Inaccurate information
- 🐛 Glitchy
- 🐛 Crashes and freezes
- 🐛 Doesn't work for iOS 26

**Reported bugs**

- Login screen freezes
- App crashes on launch
- Incompatible with iOS 26
- Registration not working
- Redirects to blank screen after login

**Requested features**

- Add ID card to Apple Wallet
- Integrate pharmacy info
- Ability to save favorite providers


### Tidemark

[App page](https://appshunter.io/ios/app/tidemark-hydration-guide/id6772892443)

This app helps you stay hydrated by showing you your target water intake level throughout the day. It focuses on guiding your progress rather than logging every sip, making hydration simple and manageable.

**Highlights:** Real-time hydration guidance, Personalized pacing, Track multiple bottles, Daily streaks, Customizable goals, Home screen widgets, Apple Health integration

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tidemark Pro Weekly | $0.99 | per 7 days |
| Tidemark Pro Monthly | $3.99 | per month |
| Tidemark Pro Yearly | $29.99 | per year |


## Frequently asked questions

### Is Surest free?

Surest is free to download, with no in-app purchases.

### Is Tidemark free?

Tidemark is free to download, with in-app purchases available.

### Which has better reviews, Surest or Tidemark?

Tidemark is rated higher. Surest averages 4.6 out of 5 from 6.5K ratings, while Tidemark averages 5.0 from 1 ratings.

### Do Surest or Tidemark have ads?

Neither Surest nor Tidemark shows ads.

### Which is updated more often, Surest or Tidemark?

Surest ships an update every 3 weeks, and Tidemark every 9 days. Most recently, Surest was updated on October 17, 2026 and Tidemark on October 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*