iSPEX vs ESRA 2025
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iSPEX
This educational tool analyzes light entering a smartphone, breaking it down by spectrum and polarization. It requires a specific hardware add-on to function.
- Spectrum analysis
- Polarization analysis
- Hardware add-on integration
- Educational tool
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iSPEX is a hardware add-on for smartphones that analyzes the light that enters it in terms of its spectrum and its polarization.
ESRA 2025
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Official app for the European Survey Research Association 2025 Conference. The conference will take place in Utrecht from 14th July to 18th July 2025 The European Survey Research Association (ESRA) is the leading professional organisation of survey researchers in Europe, with members from the academic, government, non-profit and commercial sectors. Established in 2008, ESRA aims to advance the use of survey research across all disciplines and to promote the communication and knowledge exchange between applied survey researchers, methodologists and statisticians. The conference will take place in Utrecht from 14th July to 18th July 2025, and we invite you to join us for a valuable experience filled with insightful discussions, networking opportunities, and the latest developments in the field of survey research.
Screenshots
Verdict
The clearest difference is update cadence: ESRA 2025 at every 2 weeks against iSPEX's every 2 months. On price, ads, in-app purchases and device support 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.
iSPEX ships an update every 2 months, ESRA 2025 every 2 weeks. The most recent releases landed on August 16, 2026 and September 9, 2026 respectively.
| Parameter | iSPEX | ESRA 2025 |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 5 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | DDQ | European Survey Research Association |
In-app purchases
iSPEX
No in-app purchases
ESRA 2025
No in-app purchases
