IRIS vs Karbon:Which is more popular?
In September 2026, Karbon had more branded searches than IRIS among accounting practice software in the United Kingdom. Karbon had about 2,900 branded searches, while IRIS had 1,600. Karbon made up 18.4% of all accounting practice software searches we track, and IRIS accounted for 10.2%. When we asked ChatGPT and Google AI Overviews about accounting practice software, Karbon appeared in all five answers and IRIS in three. Karbon was mentioned before IRIS in four out of five answers.
Who do people search for more?
Karbon, about 81% more searches than IRIS
Who does AI mention more?
Karbon, mentioned in every answer we collected
Who does AI recommend more?
Karbon, named ahead of IRIS in 4 of 5 answers
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Top accounting practice software in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Karbon appeared in all five answers. IRIS was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. Karbon was listed before IRIS in four out of five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
TaxDome1st- Karbon2nd
IRIS3rd
TaxCalc4th
Senta5th
Capium6th
PracticeFlow7th
Xero Practice Manager8th
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Karbon5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- TaxDome5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- TaxCalc3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- IRIS3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Capium2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Senta2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- PracticeFlow2 of 5Named in 0 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Xero Practice Manager1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about accounting practice software
5 answers
Asked ChatGPT
“What's the best practice management software for UK accountants?”
Asked ChatGPT
“Which software do UK accountancy firms use for tax returns and practice management?”
Asked ChatGPT
“What's the best practice management software for a small accounting firm in the UK?”
Searched Google, AI Overview
“practice management software for accountants”
Searched Google, AI Overview
“accounting practice management software”
Brands are shown in the order each answer named them. The survey took place in United Kingdom on October 23, 2026.
Is IRIS or Karbon more popular in search?
This chart shows how often people search Google for IRIS and Karbon by name. Each line represents a brand's share of searches for all eight accounting practice software we track, month by month, from searches in United Kingdom.
Share of searches by month for Karbon, IRIS. The figures are in the table below the chart.
View monthly share of searches table
| Month | Capium | TaxCalc | Karbon | IRIS | Senta | TaxDome | Xero Practice Manager | PracticeFlow |
|---|---|---|---|---|---|---|---|---|
| Oct 2025 | 24.7% | 30.3% | 20.2% | 10.7% | 9% | 2.7% | 2.2% | 0.39% |
| Nov 2025 | 25.8% | 31.6% | 17% | 11.1% | 9.4% | 2.3% | 2.3% | 0.53% |
| Dec 2025 | 28.7% | 28.7% | 18.9% | 8.5% | 10.4% | 2.5% | 1.7% | 0.46% |
| Jan 2026 | 25.1% | 37.7% | 16.8% | 7.4% | 8.8% | 2.2% | 1.5% | 0.42% |
| Feb 2026 | 26.8% | 26.8% | 21.9% | 9.7% | 7.9% | 3.6% | 2.4% | 0.85% |
| Mar 2026 | 22.9% | 34.4% | 18.8% | 9.9% | 8.3% | 3.1% | 2% | 0.57% |
| Apr 2026 | 21.7% | 40% | 17.8% | 7.9% | 7.9% | 2.9% | 1.3% | 0.44% |
| May 2026 | 25.7% | 31.6% | 17% | 9.4% | 11.1% | 2.8% | 1.9% | 0.53% |
| Jun 2026 | 25% | 30.7% | 20.5% | 7.4% | 10.8% | 2.7% | 2.2% | 0.63% |
| Jul 2026 | 26.7% | 32.7% | 17.6% | 7.9% | 9.7% | 2.9% | 1.9% | 0.67% |
| Aug 2026 | 23.5% | 35.2% | 18.9% | 8.5% | 8.5% | 2.5% | 2.1% | 0.72% |
| Sep 2026 | 27.9% | 27.9% | 18.4% | 10.2% | 10.2% | 3% | 1.7% | 0.7% |
How has the IRIS and Karbon comparison changed over the last 12 months?
3 findings
- Karbon was ahead of IRIS in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, IRIS’s share of searches among accounting practice software in the United Kingdom moved from 10.7% to 10.2%, and its estimated monthly branded searches moved from 1.9K to 1.6K.
- Across the 12 months ending September 2026, Karbon’s share of searches among accounting practice software in the United Kingdom moved from 20.2% to 18.4%, and its estimated monthly branded searches moved from 3.6K to 2.9K.
How did search popularity change for United Kingdom accounting practice software in September 2026?
2 changes
In September 2026, IRIS gained share of searches among accounting practice software in the United Kingdom, from 8.5% to 10.2%.
In September 2026, Karbon lost share of searches among accounting practice software in the United Kingdom, from 18.9% to 18.4%.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using IRIS’s and Karbon’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Other head-to-heads among accounting practice software
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