Otter.ai and Rev.com both offer transcription services, with Otter.ai providing free transcription up to 600 minutes per month but with lower 80% accuracy, while Rev.com has a cost of $1 per minute but higher 99% accuracy and faster 24-hour turnaround time. An alternative is Temi.com which has a lower cost of $0.10 per minute with 90-95% accuracy.