TestNav vs DERS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TestNav
This application provides a secure and reliable platform for delivering educational tests online. It ensures test items are presented consistently across devices.
- Secure test delivery
- Reliable online platform
- Consistent test item presentation
- iOS device compatibility
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TestNav is Pearson's online test delivery platform. It enables test items to be delivered online securely and reliably in a consistent manner. The TestNav for iOS app allows TestNav to run on iOS devices.
DERS
This tool assesses the quality of learning environments for children aged 2.5 to 12. It measures environmental design and implementation against desired developmental outcomes, focusing on executive functions, literacy, and social-emotional growth.
- Measures learning environment quality
- Focuses on executive functions
- Assesses literacy development
- Evaluates social-emotional growth
- Research-based environmental attributes
- Classroom observation tool
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The DERS iOS app has been deprecated. New web based DERS is now available. http://www.ders-app.org for more info. The Developmental Environmental Rating Scale (DERS) measures the quality of learning environments offered in classrooms serving children between the ages of 2.5 and 12. It aligns environmental design and implementation with desired outcomes related to executive functions, literacy, and social-emotional development. The DERS consists of 60 research-based environmental attributes or observable behaviors (child and adult) aligned with five broad aspects of human development: initiation and concentration, inhibitory control, working memory, linguistic and cultural fluency, and social fluency and emotional flexibility. The assessment is administered in a 60-minute classroom observation, during which the assessor records the presence, magnitude, and/or frequency for each item. Schools can use the DERS internally to identify priorities for continuous improvement or externally as an assessment of environmental quality. The DERS was developed by researchers at the National Center for Montessori in the Public Sector.
Verdict
The clearest difference is rating: DERS at 5.0 against TestNav's 1.6. TestNav's advantage is ratings volume (104 vs 4) and iOS requirement (13.0 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
DERS holds the better App Store score, 5.0 against 1.6. That said, the two scores are not equally well evidenced: TestNav has 104 ratings behind it against 4, so its average is the more settled of the two.
TestNav ships an update every 8 months, DERS every 5 months. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.
| Parameter | TestNav | DERS |
|---|---|---|
| Price | Free | Free |
| Rating | 1.6 (104 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 23.6% of reviews | — |
| Number of ratings | 104 — better | 4 |
| Update frequency | Every 8 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPad |
| Requires iOS | 13.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 2 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Pearson | National Centre for Montessori in the Public Sector, Inc. |
Customer experience
TestNav
DERS
Bugs and requests
TestNav
Reported bugs
6 issues- Open response boxes never work properly
- Drag and drop not working
- Permission errors for speech, mic, etc.
- App crashes all the time
- App doesn't work
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- App needs update but cannot update
Requested features
10 requests- Way to lower brightness
- Actual Dark Mode
- Allow access to Accessibility Shortcuts menu during testing
- Enable/disable inverted colors during testing
- Enable zoom during testing
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- Enable VoiceOver during testing
- Add dancing GIFs of Nick Young
- Add mini games with golf balls and levels
- Add Flappy golf extreme
- Add cross map tomahawks
DERS
Not enough reviews yet to summarise bugs or requests.
In-app purchases
TestNav
No in-app purchases
DERS
No in-app purchases
