Comparison

TallyFlex vs VOISS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

TallyFlex

This app replaces paper data sheets for behavioral data collection. It helps professionals like BCBAs and RBTs work faster and more accurately with clients in clinics, schools, and homes. It offers various tracking methods and secure data export for reports.

Highlights
  • Replace paper data sheets
  • Track ABC data, frequency, duration, latency
  • Automatic timers for interval recording
  • Task analysis and prompt codes
  • Track multiple behaviors simultaneously
  • Export data to PDF, CSV, XLSX
  • Works offline
Features
Read full description

Collect behavior and skill data, review progress, and prepare reports in one app. TallyFlex brings behavior and skill data, progress graphs, session notes, and reports together for BCBAs, RBTs, special education teachers, and other professionals. Collect during the session Track behavior and skills with frequency, duration, latency, percent correct, interval recording, and momentary time sampling. Record ABC data, break skills into task-analysis steps, and document prompt levels. Review session details Review a session’s collected data, graph, recorded events, and saved notes in one service record. Expand the event timeline to follow the sequence of recorded events. Follow progress over time Review progress graphs and add annotations for changes such as staffing or schedule updates. Organize programs into phases and targets to keep the skills you are working on connected. Bring clear reports to your next review Create PDF reports with graphs and summaries. Review session notes in a Notes Only report, or combine a day's service records, data summaries, timeline events, and notes in a Daily report. Export raw data to CSV or Excel. The Free plan includes core data collection, session notes, and basic CSV and Excel export. Programs, task analysis, prompt levels, full session timelines, and PDF reports require a paid subscription. Solo is a subscription for individual use, available through in-app purchase. Start collecting with TallyFlex. Questions? support@tallyflex.com Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

VOISS

Features
Read full description

Welcome to VOISS, the revolutionary application for teaching essential social skills to youth, ages 8-10, using immersive virtual reality (VR) scenarios. Developed by VOISS, LLC, our platform is backed by years of research conducted by the University of Kansas, which has been ranked #1 among Special Education graduate programs for 27 years in a row. VOISS allows users to practice critical social skills in a safe environment while allowing educators to monitor progress and access resources that help students extend social skill learning into the real-world. VOISS provides users with a solution that combines cutting edge technology, journal-published research, and experiential education domain knowledge that will help progress and excel in life.

Screenshots

TallyFlex4 screens
VOISS3 screens

Verdict

The call

The clearest difference is in-app purchases: VOISS at none against TallyFlex's 2. TallyFlex's advantage is update cadence (every 10 days vs every 2 months). On price, ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. TallyFlex sells 2 in-app purchases, starting at $27.99 per month. VOISS asks for nothing beyond the download.

UpkeepUpdate frequency

TallyFlex ships an update every 10 days, VOISS every 2 months. The most recent releases landed on October 12, 2026 and September 25, 2026 respectively.

Scorecard2 real differences · 8 level
TallyFlex versus VOISS: the parameters behind the verdict, then further details
ParameterTallyFlexVOISS
PriceFreeFree
Rating4.3 (87 ratings) — better—
Positive reviews64.1% of reviews—
Number of ratings87 — better—
Update frequencyEvery 10 days — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size87 MB3.2 GB
Age rating4+4+
DeveloperTallyFlex LLCVOISS, LLC

Bugs and requests

TallyFlex

Reported bugs

13 issues
  • Calendar not showing current sessions
  • Data export results in empty Excel sheet
  • Calculations and percentages are unreliable
  • Data stops being counted after a certain number of opportunities
  • Exported data format for duration is hard to graph
Show 8 more
  • Recent update messed up client info
  • Data not transferring when emailed
  • Feature to see current sessions in 'today' tab stopped working
  • Account verification email not received
  • App stuck on email verification screen
  • Account temporarily disabled
  • Cannot add students on free version
  • Cannot upgrade account

Requested features

27 requests
  • Offer a 'lite' subscription for SLPAs/BCaBAs
  • Add more data collection options/types (chaining, TAs, checklists)
  • Allow uploading pre-made data sheets
  • Add sound alerts for timers
  • Ability to re-organize behaviors on screens
Show 22 more
  • Track exemplars
  • Add sub-goals under main goals
  • Cold probe button/data collection
  • Shared sessions/collaborative data collection
  • Ability to add multiple students in one session
  • Add prompts needed for a correct response
  • macOS app that syncs
  • Ability to add other team members for consistency
  • Printable daily reports
  • More descriptive session names or notes
  • Export to CSV or Google Sheets
  • Export raw data and graph
  • Prompt required tracking
  • Add descriptions to behaviors and option to show/hide
  • Go back to list of behaviors and add current behaviors during session
  • Website for help and learning
  • Easier way to export data with graphs
  • Time-stamped keystrokes for individual bouts
  • Break down sessions further if needed
  • Export qualitative notes
  • Export session duration with time
  • Shared location for a single student

VOISS

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

TallyFlex

Subscriptions2
  • TallyFlex Solo Monthly$27.991 Month
  • Solo Yearly$279.991 Year
None

VOISS

No in-app purchases

Questions

Is TallyFlex free?
TallyFlex is free to download, with in-app purchases available.
Is VOISS free?
VOISS is free to download, with no in-app purchases.
Do TallyFlex or VOISS have ads?
Neither TallyFlex nor VOISS shows ads.
Which is updated more often, TallyFlex or VOISS?
TallyFlex ships an update every 10 days, and VOISS every 2 months. Most recently, TallyFlex was updated on October 12, 2026 and VOISS on September 25, 2026.

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