True cost comparison — not just what the pricing page says
Quick Verdict
ConvertKit saves you 100%
Best for ConvertKit
Creator-focused email marketing platform (now branded as Kit). Free for 10,000 subscribers but limit
Best for Microsoft 365
Microsoft's business productivity suite (Outlook, Teams, Office apps). Per-user pricing where deskto
Creator-focused email marketing platform (now branded as Kit). Free for 10,000 s...
Advertised
$0
/month
True Cost
$109
/month (typical)
Subscriber-Based Pricing Scaling
Creator plan: 1K subs = $29/mo, 5K = $79/mo, 10K = $119/mo, 55K = $379/mo. Cost roughly doubles ever...
Free Plan Send Restriction
Free plan allows only 1 email broadcast per month to 10,000 subscribers. Daily or weekly newsletters...
No A/B Testing on Free or Creator
A/B testing subject lines requires Creator Pro ($59/mo minimum). Creator plan only supports basic br...
$25/mo annual
$50/mo annual
Affiliate link — we may earn a commission
Microsoft's business productivity suite (Outlook, Teams, Office apps). Per-user ...
Advertised
$6
/month
True Cost
$114
/month (typical)
Desktop Apps Require Business Standard
Business Basic ($6/user/mo) only includes web and mobile Office apps. Desktop Word, Excel, PowerPoin...
Copilot AI Add-On
Microsoft 365 Copilot AI is $30/user/mo — separate from all base plans. For 50 users, Copilot alone ...
Compliance Features Require E5
Advanced compliance (eDiscovery, DLP, Information Barriers, Insider Risk Management) require Enterpr...
Teams Phone Add-On
Microsoft Teams Phone System for PSTN calling is not included in any standard plan. Teams Phone Stan...
ConvertKit advertises $0/mo. Microsoft 365 advertises $6/mo.
ConvertKit has 3 documented hidden fees. Microsoft 365 has 4.
ConvertKit confidence: 76%. Microsoft 365 confidence: 84%.
| Metric | ConvertKit | Microsoft 365 | Winner |
|---|---|---|---|
| Advertised Price | $0/mo | $6/mo | ConvertKit |
| True Monthly Cost | $109/mo | $114/mo | ConvertKit |
| Hidden Fee Total | +$109/mo | +$107.5/mo | Microsoft 365 |
| # Hidden Fees | 3 | 4 | ConvertKit |
| Confidence Score | 76% | 84% | Microsoft 365 |
| Pricing Tiers | 3 | 3 | — |
| Affiliate Program | 30% recurring for 24 months | No public affiliate program | — |
Try the tool that fits your needs. Both offer free trials or free tiers.
From $0/mo
✓ Saves 100% on true costAffiliate link — we may earn a commission
ConvertKit advertises $0/mo and Microsoft 365 advertises $6/mo. However, when you include hidden fees, ConvertKit has 3 documented hidden fees adding +$109/mo, while Microsoft 365 has 4 hidden fees adding +$107.5/mo. Based on true cost, ConvertKit is typically 100% cheaper.
ConvertKit has 3 documented hidden fees: Subscriber-Based Pricing Scaling, Free Plan Send Restriction, No A/B Testing on Free or Creator. These add approximately +$109/mo on top of the $0/mo advertised price.
Microsoft 365 has 4 documented hidden fees: Desktop Apps Require Business Standard, Copilot AI Add-On, Compliance Features Require E5, Teams Phone Add-On. These add approximately +$107.5/mo on top of the $6/mo advertised price.
Choose ConvertKit if: Creator-focused email marketing platform (now branded as Kit). Free for 10,000 subscribers but limit. Choose Microsoft 365 if: Microsoft's business productivity suite (Outlook, Teams, Office apps). Per-user pricing where deskto. The right choice depends on your team size, usage volume, and which features you need most.
This comparison is based on manual research of official pricing pages, terms of service, and user reports. ConvertKit data has a 76% confidence score and Microsoft 365 has 84%. Prices were last verified in April 2026. For the most accurate estimate, enter your specific usage in our calculator.
Enter your usage to see personalized pricing for both tools
Use Free Calculator