ERSB Lite vs CGMSIM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ERSB Lite
This app builds early reading skills for students progressing from foundational literacy. It uses systematic instruction and assessments to help individuals read independently, proving effective for those with intellectual disabilities and autism.
- Early literacy skill development
- Systematic instruction
- Ongoing assessments
- Progress to 2nd-grade reading level
- Effective for intellectual disabilities
- Effective for autism
Read full descriptionHide full description
Note: This is the Free version of ERSB. Level 1 with 5 lessons is Free! The rest of the levels are available through the in-app store. Early Reading Skills Builder™(ERSB) curriculum, based on a multi-year research project from the University of North Carolina at Charlotte, is a stepping stone for graduates of Attainment’s ELSB Curriculum. ERSB takes students who mastered these early literacy skills to a 2nd grade reading level. It incorporates systematic instruction and ongoing assessments to teach students to read independently. It’s been proven effective for students with moderate to severe intellectual disability and/or autism, including those with complex communication needs.
CGMSIM
Simulate managing Type 1 Diabetes by administering meals and insulin. Maintain target blood glucose levels while minimizing lows and highs. Integrate activity data for a realistic experience.
- Virtual Type 1 Diabetes subject management
- Meal and insulin administration (MDI/CSII)
- Glycemic target range maintenance
- Hypo/hyperglycemia alerts
- Activity tracker integration (Fitbit, Google Fit)
- Nightscout CGM trace display
- Success report generation
Read full descriptionHide full description
CGMSIM lets you create a virtual Type 1 Diabetes subject, that you'll treat 24/7 with meals, multiple daily insulin injections (MDI) or a virtual insulin pump (CSII - continuous subcutaneous insulin infusion). Your goal is to maintain your virtual subject's glycemia in the treatment range 70-180 mg/dl (3.9 - 10 mmol/l) at least 70% of the time, with as few low glucose values as possible. Optional hypo- and hyperglycemia are delivered as push notifications and email alerts. CGMSIM imports your Fitbit® activity tracker's or Google Fit® activity data (steps, heart rate), which influence your subject's glycemic status. The CGM trace is displayed in Nightscout, where success reports can be generated.
Screenshots
Verdict
The clearest difference is review sentiment: CGMSIM at 100% against ERSB Lite's 0%. CGMSIM also leads on rating (5.0 vs 4.0) and in-app purchases (none vs 5). ERSB Lite's advantage is iOS requirement (13.0 vs 15.1). On price, ratings volume, update cadence and ads 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. ERSB Lite sells 5 one-off in-app purchases. CGMSIM asks for nothing beyond the download.
CGMSIM holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 0% of ERSB Lite's written reviews are positive against 100% of CGMSIM's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on June 2, 2026 and September 16, 2026 respectively.
| Parameter | ERSB Lite | CGMSIM |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (3 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 — better | 2 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 253 MB | 43 MB |
| Age rating | 4+ | 12+ |
| Developer | Attainment Company, Inc. | Lorenzo Sandini |
Customer experience
ERSB Lite
CGMSIM
In-app purchases
ERSB Lite
- Levels 12-16$29.99
- Levels 17-21$29.99
- Levels 22-26$29.99
Show 2 moreShow fewer
- Levels 2-6$29.99
- Levels 7-11$29.99
CGMSIM
No in-app purchases









